Question

Main question is: How to run the code within TestingButton_Click on several threads in background (similar to BackgroundWorker) so I will be able to:
1. Get all the raw data to the methods
2. Cancel test for all threads simultaneously
3. Report progress
4. Retrieve all the result tables to main thread.

The following code is within TestingButton_Click

List<Thread> threads = new List<Thread>();

            //Testing for each pair
            foreach (InterfaceWithClassName aCompound in Group1)
            {
                foreach (InterfaceWithClassName bCompound in Group2)
                {
                    InstancePair pair = new InstancePair();
                    //some code

                    if (testModeParallel)
                    {
                        Thread thr = new Thread(TestPairParallel);
                        thr.Start(pair);
                        threads.Add(thr);
                    }

                    else
                    {
                        Thread thr = new Thread(TestPairSerial);
                        thr.Start(pair);
                        threads.Add(thr);
                    }
                }
            }              

            while (true)
            {
                int i = 0;

                foreach (Thread thread in threads)
                {
                    if (thread.IsAlive)
                        break;

                    i++;
                }

                if (i == threads.Count)
                    break;

                Thread.Sleep(1000);
            }
            pairsResultsDataGrid.ItemsSource = tab.DefaultView

User is able to choose what compounds to test so every time I have different number of pairs to test.
I made to different methods TestPairSerial() and TestPairParallel() just in case.

TestPairSerial() structure is

        do
        {
            do
            {

            } while (isSetbCompaundParams);

        } while (isSetaCompaundParams);

        //filling up results into tables (main window variables) later to be connected to DataGrids

TestPairParallel() is implemented with InfinitePartitioner and using similar structure only with Parallel.ForEach(new InfinitePartitioner(),…

Thank you for your help.

Answer 1

How to run the code within TestingButton_Click on several threads in
background.

I would use a Task as they were design to do exactly what you want.

The only other question I will answer until you get closer to the actual solution is the following:

Report progress

There are lots of ways to report the progress on a given thread, you would have to subscribe to an event, and write code to report the progress of the thread. In order to update a control on the form, this would require you Invoke the change, this is not a trivial feature.